National Grid’s Remediation Contractor continued with site remediation activities, which included the delivery of construction materials, imported backfill material (stone and common fill), as well as construction equipment and supplies.  Tent Position #9 Shallow Excavation activities commenced with off-site transport to and disposal of impacted soils at approved and permitted disposal facilities.  Backfill material placement and compaction activities also commenced inside Tent Position #9.  Temporary sheet piling continue to be removed and staged on-site. Development of Recovery Well RW 16B was performed. In addition, the on-site two-foot cut and backfill along the eastern fence line of the electric substation was completed. Common fill material deliveries and grading activities continued to support the Cap construction.  National Grid’s consulting engineer conducted noise and vibration monitoring activities, as necessary.

Maintenance of the decontamination areas, work zones, on-site gravel access roads, parking areas and material staging areas, imported backfill material (i.e., clean fill), stockpile covers, the perimeter privacy screen, and soil erosion and sediment control (SESC) measures continued. Odor and dust suppression activities were conducted, as necessary. National Grid’s consulting engineers continued to monitor the site activities with the community air monitoring program (CAMP) equipment.

During the period from August 16, 2010 through August 22, 2010, six fixed base CAMP units and two portable CAMP units were in-use and measured total volatile organic compounds (TVOC) and particulates (PM10). Fifteen-minute averages for both TVOC and PM10 data remained in the Operational Condition.  The Weekly Report that summarizes the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of August 23, 2010 through August 27, 2010, Tent Position #9 Shallow Excavation activities are scheduled to continue with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Temporary sheet piling will continue to be removed and staged on-site for re-use or for future demobilization from the Site, as appropriate. Odor and dust suppression activities will be conducted, as necessary.  Work zone delineation, site maintenance activities, CAMP operation monitoring activities will continue, and noise and vibration monitoring activities will continue, as necessary.